Yan created SPARK-3306:
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             Summary: Addition of external resource dependency in executors
                 Key: SPARK-3306
                 URL: https://issues.apache.org/jira/browse/SPARK-3306
             Project: Spark
          Issue Type: New Feature
          Components: Spark Core
            Reporter: Yan


Currently, Spark executors only support static and read-only external resources 
of side files and jar files. With emerging disparate data sources, there is a 
need to support more versatile external resources, such as connections to data 
sources, to facilitate efficient data accesses to the sources. For one, the 
JDBCRDD, with some modifications,  could benefit from this feature by reusing 
established JDBC connections from the same Spark context before.



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